The new FS-Cache API does not have a readpages equivalent function, and instead of fscache_read_or_alloc_pages() it implements a readahead function, netfs_readahead(). Call netfs_readahead() if fscache is enabled, and if not, utilize readahead_page() to run through the pages needed calling readpage_async_filler(). If we get an error on any page, then exit the loop, which matches the behavior of previously called read_cache_pages() when 'filler' returns an error. Signed-off-by: Dave Wysochanski <dwysocha@xxxxxxxxxx> --- fs/nfs/file.c | 2 +- fs/nfs/fscache.c | 50 ++++++++++------------------------------------ fs/nfs/fscache.h | 28 ++++---------------------- fs/nfs/read.c | 36 ++++++++++++++++----------------- include/linux/nfs_fs.h | 3 +-- include/linux/nfs_iostat.h | 2 +- 6 files changed, 35 insertions(+), 86 deletions(-) diff --git a/fs/nfs/file.c b/fs/nfs/file.c index 63940a7a70be..ebcaa164db5f 100644 --- a/fs/nfs/file.c +++ b/fs/nfs/file.c @@ -515,7 +515,7 @@ static void nfs_swap_deactivate(struct file *file) const struct address_space_operations nfs_file_aops = { .readpage = nfs_readpage, - .readpages = nfs_readpages, + .readahead = nfs_readahead, .set_page_dirty = __set_page_dirty_nobuffers, .writepage = nfs_writepage, .writepages = nfs_writepages, diff --git a/fs/nfs/fscache.c b/fs/nfs/fscache.c index fede075209f5..65fb9065a70c 100644 --- a/fs/nfs/fscache.c +++ b/fs/nfs/fscache.c @@ -502,51 +502,21 @@ int nfs_readpage_from_fscache(struct file *file, /* * Retrieve a set of pages from fscache */ -int __nfs_readpages_from_fscache(struct nfs_open_context *ctx, - struct inode *inode, - struct address_space *mapping, - struct list_head *pages, - unsigned *nr_pages) +int nfs_readahead_from_fscache(struct nfs_readdesc *desc, + struct readahead_control *ractl) { - unsigned npages = *nr_pages; - int ret; + struct inode *inode = ractl->mapping->host; - dfprintk(FSCACHE, "NFS: nfs_getpages_from_fscache (0x%p/%u/0x%p)\n", - nfs_i_fscache(inode), npages, inode); - - ret = fscache_read_or_alloc_pages(nfs_i_fscache(inode), - mapping, pages, nr_pages, - NULL, - ctx, - mapping_gfp_mask(mapping)); - if (*nr_pages < npages) - nfs_add_fscache_stats(inode, NFSIOS_FSCACHE_PAGES_READ_OK, - npages); - if (*nr_pages > 0) - nfs_add_fscache_stats(inode, NFSIOS_FSCACHE_PAGES_READ_FAIL, - *nr_pages); + if (!NFS_I(ractl->mapping->host)->fscache) + return -ENOBUFS; - switch (ret) { - case 0: /* read submitted to the cache for all pages */ - BUG_ON(!list_empty(pages)); - BUG_ON(*nr_pages != 0); - dfprintk(FSCACHE, - "NFS: nfs_getpages_from_fscache: submitted\n"); + dfprintk(FSCACHE, "NFS: nfs_readahead_from_fscache (0x%p/%u/0x%p)\n", + nfs_i_fscache(inode), readahead_count(ractl), inode); - return ret; + netfs_readahead(ractl, &nfs_fscache_req_ops, desc); - case -ENOBUFS: /* some pages aren't cached and can't be */ - case -ENODATA: /* some pages aren't cached */ - dfprintk(FSCACHE, - "NFS: nfs_getpages_from_fscache: no page: %d\n", ret); - return 1; - - default: - dfprintk(FSCACHE, - "NFS: nfs_getpages_from_fscache: ret %d\n", ret); - } - - return ret; + /* FIXME: NFSIOS_NFSIOS_FSCACHE_ stats */ + return 0; } /* diff --git a/fs/nfs/fscache.h b/fs/nfs/fscache.h index 858f28b1ce03..faccf4549d55 100644 --- a/fs/nfs/fscache.h +++ b/fs/nfs/fscache.h @@ -98,12 +98,10 @@ struct nfs_fscache_inode_auxdata { extern int nfs_readpage_from_fscache(struct file *file, struct page *page, struct nfs_readdesc *desc); -extern int __nfs_readpages_from_fscache(struct nfs_open_context *, - struct inode *, struct address_space *, - struct list_head *, unsigned *); +extern int nfs_readahead_from_fscache(struct nfs_readdesc *desc, + struct readahead_control *ractl); extern void nfs_read_completion_to_fscache(struct nfs_pgio_header *hdr, unsigned long bytes); - /* * wait for a page to complete writing to the cache */ @@ -126,21 +124,6 @@ static inline void nfs_fscache_invalidate_page(struct page *page, } /* - * Retrieve a set of pages from an inode data storage object. - */ -static inline int nfs_readpages_from_fscache(struct nfs_open_context *ctx, - struct inode *inode, - struct address_space *mapping, - struct list_head *pages, - unsigned *nr_pages) -{ - if (NFS_I(inode)->fscache) - return __nfs_readpages_from_fscache(ctx, inode, mapping, pages, - nr_pages); - return -ENOBUFS; -} - -/* * Invalidate the contents of fscache for this inode. This will not sleep. */ static inline void nfs_fscache_invalidate(struct inode *inode) @@ -195,11 +178,8 @@ static inline int nfs_readpage_from_fscache(struct file *file, { return -ENOBUFS; } -static inline int nfs_readpages_from_fscache(struct nfs_open_context *ctx, - struct inode *inode, - struct address_space *mapping, - struct list_head *pages, - unsigned *nr_pages) +static inline int nfs_readahead_from_fscache(struct nfs_readdesc *desc, + struct readahead_control *ractl) { return -ENOBUFS; } diff --git a/fs/nfs/read.c b/fs/nfs/read.c index b47e4f38539b..8be4f179a371 100644 --- a/fs/nfs/read.c +++ b/fs/nfs/read.c @@ -390,50 +390,50 @@ int nfs_readpage(struct file *file, struct page *page) return ret; } -int nfs_readpages(struct file *file, struct address_space *mapping, - struct list_head *pages, unsigned nr_pages) +void nfs_readahead(struct readahead_control *ractl) { struct nfs_readdesc desc; - struct inode *inode = mapping->host; + struct inode *inode = ractl->mapping->host; + struct page *page; int ret; - dprintk("NFS: nfs_readpages (%s/%Lu %d)\n", - inode->i_sb->s_id, - (unsigned long long)NFS_FILEID(inode), - nr_pages); + dprintk("NFS: %s (%s/%llu %lld)\n", __func__, + inode->i_sb->s_id, + (unsigned long long)NFS_FILEID(inode), + readahead_length(ractl)); nfs_inc_stats(inode, NFSIOS_VFSREADPAGES); - ret = -ESTALE; if (NFS_STALE(inode)) - goto out; + return; - if (file == NULL) { - ret = -EBADF; + if (ractl->file == NULL) { desc.ctx = nfs_find_open_context(inode, NULL, FMODE_READ); if (desc.ctx == NULL) - goto out; + return; } else - desc.ctx = get_nfs_open_context(nfs_file_open_context(file)); + desc.ctx = get_nfs_open_context(nfs_file_open_context(ractl->file)); /* attempt to read as many of the pages as possible from the cache * - this returns -ENOBUFS immediately if the cookie is negative */ - ret = nfs_readpages_from_fscache(desc.ctx, inode, mapping, - pages, &nr_pages); + ret = nfs_readahead_from_fscache(&desc, ractl); if (ret == 0) goto read_complete; /* all pages were read */ nfs_pageio_init_read(&desc.pgio, inode, false, &nfs_async_read_completion_ops); - ret = read_cache_pages(mapping, pages, readpage_async_filler, &desc); + while ((page = readahead_page(ractl))) { + ret = readpage_async_filler(&desc, page); + put_page(page); + if (unlikely(ret)) + break; + } nfs_pageio_complete_read(&desc.pgio, inode); read_complete: put_nfs_open_context(desc.ctx); -out: - return ret; } int __init nfs_init_readpagecache(void) diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h index 3cfcf219e96b..968c79b1b09b 100644 --- a/include/linux/nfs_fs.h +++ b/include/linux/nfs_fs.h @@ -568,8 +568,7 @@ extern int nfs_access_get_cached(struct inode *inode, const struct cred *cred, s * linux/fs/nfs/read.c */ extern int nfs_readpage(struct file *, struct page *); -extern int nfs_readpages(struct file *, struct address_space *, - struct list_head *, unsigned); +extern void nfs_readahead(struct readahead_control *rac); /* * inline functions diff --git a/include/linux/nfs_iostat.h b/include/linux/nfs_iostat.h index 027874c36c88..8baf8fb7551d 100644 --- a/include/linux/nfs_iostat.h +++ b/include/linux/nfs_iostat.h @@ -53,7 +53,7 @@ * NFS page counters * * These count the number of pages read or written via nfs_readpage(), - * nfs_readpages(), or their write equivalents. + * nfs_readahead(), or their write equivalents. * * NB: When adding new byte counters, please include the measured * units in the name of each byte counter to help users of this -- 1.8.3.1